Still, I would like the idea of the Civil War in Kusari - what would make it more interesting. You know, kind in the way what was supposed to be in Gallia, but Pro-Sirius side of Gallic Civil War just lost.
Another interesting RP addition would be suppling the Gallic and Anti-Gallic sides - one by Rheinland (which likes Republic) and Liberty (who nowadays recognise the threat of Gallia, which is closer and closer to the Liberty Space), but also because the ongoing Liberty-Rheinland War (think of USSR and USA supplying North and South Vietnam). What do you think?
For RP side of Kusari, I think the best solution would be to stay with the minimum of Japanese - even if my hobby is Japanese history and culture of Warring States (Sengoku Jidai; Senji) and Tokugawa-Edo Period. You know, most known words, like "sayonara", "hai", "arigato", "mon" and so on - to not to scare the newbies.
On side note, I believe that Kusari Destroyers are or were the backbone of the KNF. They have shape of the kusari-gama, the specific weaponry of Japanese origin, which was made of small scythe and chain. Kusari, the scythe as the destroyer, and the chain, which would ressemble the connection to the fleet and government. Also, Kusari takes name from this weapon. But it's just me.
After all, for my taste, the Republic of Kusari idea sounds a bit like 1930s in Japan, where role of Emperor was just marginal, yet there are some additions from 1870s, the end of the samurai. But mostly I would also point out the similarity with 1910s in China as the Qing Dynasty was finally overthrown and Repulic of China (in present times it's Taiwan) was founded. And this is the most close thing to the current situation in Kusari, in my humble opinion.